Symmetrical alicyclic amine derivatives



This invention relates to symmetrical alicyclic amine derivatives. More particularly, the invention relates to amine derivatives which can be represented by the following structural formula:

ont

3,064,052 Patented Nov. 13, 1962 alkyl group and acid anion, e.g. an alkyl halide such as methyl chloride.

The novel secondary and tertiary amines and their acid addition salts, formed from inorganic or organic acids, particularly the mineral acids, which are used as intermediates are also part of this invention.

he compounds of this invention are useful as antimicrobial agents, for example, in combatting infections due to bacteria, such as Streptococci and Staphylococci (including Staphylococcus strains resistant to antibiotics) and protozoa such as Trichomonas vaginalis. These substances may be applied topically, for example in the form of creams, lotions, ointments, etc., or may be adwherein m represents 0 or l, rr represents an integer from 2 to l2 and X represents an acid anion.

The lower alkyl groups in the above formula include such groups as methyl, ethyl, proyl, isopropyl, etc. The acid anions in Formula 1 are anions of medicinally acceptable inorganic or organic acids such as the anions of the mineral acids, e.g. Sulfate, phosphate, nitrate, the Ahalides, for example, chloride, bromide, iodide, etc., or the anions of organic acids such as benzenesulfonate, toluenesulfonate, citrate, tartrate, etc. The halides, and especially the chloride, are preferred. In the compounds represented by the above structural formula, the lower alkyl groups are the same, the two acid anion groups are the same and m has the same value in each part of the molecule, so that in each instance the compound is structurally symmetrical. It is understood, however, that compounds of Formula I can exist in different spatial configurati-ons, which are also within the scope of this invention.

When m=0 in Formula l, the compounds may be synthesized from -ionone; when m=l, the compounds may be synthesized from 4(2,6,6-trimethyl-l-cyclohexenlyl)2methyl 2 outen-l-al, [IS-CM-aldehydel Two alternate routes may be followed. For example, ionone is reductively condensed with methylamine in the presence of a reducing catalyst such as Raney nickel to obtain the corresponding secondary amine, [l-methyl3 (2,6,6-trimethyl-l-cyclohexen l-yl)propyl]methylamine. When -Cl., aldchyde is used, [2-methyl-4-(2,6,6ftrimethyl-l-cyclohexenl-yl) butyl] methylarnine is obtained. The secondary amine is converted to a tertiary alkyl amine by treatment, for example, with formic acid-formaldehyde. rl`he double bond of the cyclohexene ring is then catalytically reduced, eg. with a platinum catalyst. The appropriate a,wdihaloalkane is then reacted with two equivalents of the saturated tertiary amine to give the desired symmetrical compound of Formula I.

Alternatively, the saturated ketone, e.g. cis-tetrahydroionone, is reductively condensed in the presence of Raney nickel or a noble metal catalyst with one-half equivalent of the appropriate ,w-diaminoalkane to obtain a saturated diamine. For example, when cis-tetrahydroionone is reductively condensed with one-half equivalent of 1,6- hexanediamine, N,Nbis[l methyl 3-(2,2,6trimethyl cyclohexyD-propyl]-l,6hexanediarnine is obtained. Reacting the lsaturated diamine, for example with formic acid`formaldehyde, converts it to the di-tertiary amine. The latter is then quaternized by treatment with an ex- -cess of a quaternizing agent containing the appropriate ministered parenterally, for example, in a sterile medium such as water, by incorporating therapeutic dosages in carriers, excipients, etc. according to accepted practice.

The following examples are illustrative of the invention. All temperatures are stated in degrees centigrade.

Example I Five tsp. of Raney nickel catalyst were added to a solution of 250 g. of -ionone and 200 g. of anhydrous methylamine in 400 ml. of methanol. The mixture was hydrogenated at 150 and at a pressure of 1500 p.s.i. The catalyst was iiltered off, the excess methylamine and methanol were distilled of and lthe residual oil was fractionated in vacuo to give [l-methyl-3-(2,6,6trimethyl-l cyclohexenfl-yDpropyl]methylamine, B.P. 117-119er at 5 mm.

To 62 g. of [l-methyl-3(2,6,6-trimethyl-l-cyclohexenl-yl)propyl]methylamine, dissolved in 38 m1. of 90% formc acid, were added 28.5 ml. of 35% formaldehyde. The solution was stirred on a steam bath for 3 hours, and the excess formaldehyde and formic acid were distilled off. The residual oil was made strongly alkaline with 50% potassium hydroxide and then extracted with ether. The ether extract was washed with water, dried and the ether was distilled oil'. The residual oil was fractionated in vacuo to give [l-methyl-3(2,6,6trimeth yl-l-cyclohexen-l-yl)propyl]dimethylamine, B.P. 97-99 at 2 mm. An alcoholic solution of the latter, when treated with hydrogen chloride, gave the crystalline hydrochloride, M.P. 69-71" (crystallized from acetonitrileether).

To 4.0 g. yof platinum oxide in 100 ml. of glacial acetic acid were added 62 g. (0.24 mol) of [lrnethyl3-(2,6,6 trimethyl#l-eyclohexen-1yl)propyl]dimethylamine hydrochloride and the volume was adiusted to 300 ml. with glacial acetic acid. The mixture was hydrogenated at 100 and at pressure of 1000 p.s.i. The catalyst was filtered olf and the colorless ltrate was concentrated, at steam temperature and water vacuum, until a syrup remained. rl`he latter was triturated with ether and crystallized from ethanol-ether. The [lmethyl3-(2,2,6tri methylcyclohexyl propyl] dimethylamine hydrochloride melted at 12S-127. lt is hygroscopic. y

The hydrochloride obtained above Was dissolved in water, neutralized with aqueous sodium hydroxide and the mixture Was extracted with ether. The ether was distilled off to obtain the free base, [lmethyl-3-(2,2,6tri

- methylcyclohexyl propyl] dimethylamine.

.(methobromide) tion was stored overnight at room temperature.

tained. The latter was crystallized from acetonitrile-ether to obtain N,Nbis[1rnethyl 3 (2,2,6-trimethylcyclohexyl)propyl]-N,N'dimethyl 1,3-propanediamine bis- Upon recrystallization from acetonitrile-ether, the compound melted at 214-216", with decomposition.

Example 2 4.5 g. (0.02 mol) of El-methyl-3-(2,2,6-trimethylcyclohexyl)-propyl]dimethylamine and 2.3 g. (0.01 mol) of 1,5-dibromopentane were reacted according to the procedure in the last paragraph of Example 1 to obtain N,N bis[1-methyl-3(2,2,6-trirnethylcyclohexyl) propyl] N, N' dimethyl 1,5 pentanediamine bis(methobromide), M.P. 253-155 with decomposition (crystallized from methanol-acetonitrile) Example 3 Example 4 To a solution of 49 g. (0.25 mol) of cis-tetrahydroionone and 14.1 g. (0.12 mol) of 1,6-hexanediamiue in 150 ml. of ethanol was added l teaspoon of Raney nickel.

'The volume was adjusted to 300 ml. with ethanol and the mixture was hydrogenated at 50 and a pressure of 200 p.s.i. The catalyst was filtered off, the ltrate was concentrated and the residual oil fractionated in vacuo to obtain N,N'bis[1 methyl-3-(2,2,6-trirnethylcyclohexyl) propyl]-l,6hexanediarnine; B.P. l92-202 at 0.02 mm.

An aliquot, when treated with alcoholic hydrogen l chloride, gave N,Nbis[l-rnethyl-S-(2,2,6-trimethylcyclohexyl)propyl]-1,6hexanediamine dihydrochloride; M.P. 197-199" (crystallized from ethanol-ether).

To 217 g. (0.456 mol) of N,Nbis[1-metl1yl-3-(2,2,6 trimethylcyclohexyl)propyl]1,6hexanediamine were added 182 ml. (3.04 mols) of formic acid (90%). The resulting colorless solution was cooled, then 91.3 ml. (1.043 mols) of formaldehyde (37%) were added. The solution was heated at steam temperature with occasional shaking for 2 hours and then reuxed for 8 hours. The volatiles were distilled oi at steam temperature under Water vacuum and the residual oil was made strongly alkaline with 50% potassium hydroxide. The reaction product was extracted with ether. The ether extract was Washed with Water, dried and concentrated in vacuo. The residual oil Was fractionated in vacuo to obtain N,N' bis[1 methyl-3-(2,2,6 trimethylcyclohexyl)propyl]-N, Ndimethyl1,6-hexanediamine, B.0 4 230-240, 111326 1.4833. An aliquot, when treated with an ethanolic hydrogen chloride, gave the crystalline dihydrochlorde, M.P. 183185 (recrystallized from ethanolacetonitrile).

To 5 g. of N,N'bis[l-methyl-3-(2,2,6-trimethylcyclohexyl)propyl] N,N dimethyl 1,6-hexanediamine, dissolved in 150 ml. of acetone, were added 50 ml. of a 40% solution of methyl bromide in acetone. The solu- The crystals which had formed Were filtered ofr, Washed with acetone and dried to obtain N.N'bis[methyl-3-(2,2,6tri methylcyclohexyl)propyl] N,N dimethyl-1,6-hexanediamine bis(methobromide), M.P. 26S-266.

'Il-le reductive condensation described in the first paragraph of this example Was repeated using instead of Raney nickel catalyst (l) 1.5 g. of platinum oxide and in a separate experiment (2) 1.5 g. of 10% palladiumon-calcium carbonate to obtain the same product, N,N bis[1methyl3(2,2,6 trimethylcyclohexyl)propyl] 1,6- hexanediamine.

Example 5 To 5 g. of N,N'bis[1-methy1-3-(2,2,6-trimethylcyclohexyl)propyl] N,N' dimethyl- 1,6 hexanediamine dissolved in ml. of methanol, at 4, were added 100 ml. methanol containing 10 g. of methyl chloride. The solution was heated in a closed vessel at 60 for 15 hours. The colorless solution was concentrated and the resulting White solid crystallized from ethanol-acetonitrile-ether to obtain N,N'bis[1 methyl-3(2,2,6-trimethylcyclohexyl) propyl]-N,N'-dimethy11,6-hexanediamine bis(methochlo ride) hemihydrate.

Example 6 To 5 g. of N,Nbis[l-methyl-3-(2,2,6-trimethylcyclohexyl)propyl] N,N' dimethyl 1,6 hexanediamine, dissolved in 100 ml. of methanol, were added 10 g. of methyl p-toluenesulfonate, dissolved in 100 ml. of acetone. The resulting solution was reuxed for 18 hours, concentrated, and the syrup crystallized from acetonitrileacetone-ether to obtain N,Nbis[1rnethyl3-(2,2,6trimethylcyclohexyl)propyl]-N,Ndimethyl 1,6 hexanediamine bis(methyl p-toluenesulfonate), M.P. 191-193.

Example 7 To 0.5 g. of N,N'bis[1methyl3(2,2,6-trimethylcyc1ohexyl) propyl] N,N' dimethyl- 1,6 hexanediamine bis- (methobromide), dissolved in 100 ml. of water, was added an excess of dilute nitric acid. A white precipitate formed. It Was filtered off, washed with Water and recrystallized from 25% ethanol to obtain N,N'bis[1meth yl-3-(2,2,6-trimethylcyclohexyl)propyl] N,N dimethyl- 1,6-hexanediamine bis(metl1yl nitrate), M.P. 287-288", With decomposition.

Example 8 4.0 g. (17.8 mmols) of [1-methyl3(2,2,6-trimethylcyclohexyDpropyl] dimethylamine and 2.4 g. (8.9 mmols) of 1,8-dibromooctane were reacted according to the procedure described in the last paragraph of Example 1 to obtain N,Nbis[ 1 methyl- 3 (2,2,6-trimethylcyclohexyl)- propyl]N,N-dimethyl1,8 octanediamine bis(methobromide), M.P. 21S-217, with decomposition (crystallized from acetonitrile-ether).

Example 9 4.0 g. (17.8 mmols) of [1-methyl-3(2,2,6dimethyl cyclohexyDpropyl]dimethylamine and 2.7 g. (8.9 mmols) of 1,10-dibromodecane were reacted according to the Example 10 To a solution of 200 g. of 4-(2,6,6trimethyll-cyclohexen-l-yl)-Z-methyl-Z-buteu-l-al and g. of anhydrous methylamine in 300 ml. of methanol were added three teaspoons of Raney nickel catalyst. The mixture was hydrogenated at and a pressure of 1500 p.s.i. The catalyst was filtered off, and the excess methylamine and methanol were distilled ot. To the residual oil, dissolved in 114 ml. of 90% formic acid, were added 85.5 rnl. of 35% formaldehyde. The solution was stirred on a steam bath for 3 hours, and the excess formaldehyde and formic acid were distilled off. The residual oil was made strongly alkaline with 30% sodium hydroxide and the mixture was extracted with ether. The ether extract was Washed with water, dried with potassium carbonate 5 and the ether was distilled oi. The residual oil was fractonated in vacuo to give N-[2-methy1-4-(2,6,6-trimethylis We claim: 1. A compound represented by the formula CH3\ /CHa CH:4\ /CHs /C\ (lower alkyDg (llower alkyDg H\ /C\ 112C o-oHr-CHT-0H- oH2 mrr oHz l *(oHnVoH-CHT-CHZ-IIJ ou; H2C\ /C\\H CH3 X X CH3 HC\ /CHz C CH3 CH3 C Hz H2 1-cyclohexen-1-yl)butyl] dimethylamine, B.P. 100 at 0.4 wherein: mm. When treated with alcoholic hydrogen chloride, the crystalline hydrochloride was obtained, M.P. 150- lnlsalnirfnzotol and 151 (crystallized for acetonitrile-ether).

50 g. of N [2 methy1 4 (2, 6 6 trimethy1 I cyclohexeml* l5 X represents a medlcinally acceptable acid anlon. y1)butyl]dimethylamine hydrochloride and 3.5 g. of 2. A Compound represented by the formula CH3 CH3 CH3 CH3 \C H (loweralkylh (lower alkyl HzC/ \CCHz-CHz-CH-N CH2 -Il CH-CHz-CHz-C (IH:

H2O C-H CH3 halogen halogen CH3 H-C CH2 \C/ \CH3 CH3 \C/ H2 H2 wherein .halogen represents a member selected from the group consisting of chlorine, bromine, and iodine.

30 kylhalide), said halide being selected from the group consisting of chloride, bromide, and iodide.

5. A compound selected from the group consisting of bases represented by the formula cedure described in the last paragraph of Example 1 to 45 wherein:

obtain N,N bis[2 methyl-4-(2,2,-trimethylcyclohexyl) butyl] N,N dimethyl-1,6-hexanediamine bis(methobro mide), M.P. 23S-237 with decomposition (crystallized from ethanol-ether).

Example 11 To 20 g. of N,Nbis[1methyl3(2,2,6-trimethylcyclohexyl)propyl]-N,Ndimethyl 1,6 hexanediamine, dissolved in 250 ml. of ethanol, were added 21.8 g. of ethyl m represents an integer from 0 to 1 and n represents an integer from 2 to 12.

50 propyl]-1,6-hexanediamine.

8. A compound selected from the group consisting of bases represented by the formula.

CH3 CH3 CH3 CH3 C H lower alkyl lower alkyl H26/ \CCHr-CH2CH(CH2)ml(CH2)u-dI-Hnm-CH-CHZCHC/ \CH Hzo c-H CH3 ons H-d (IJHZ \C/ `\CH3 CH3 \C/ H2 2 bromide. The solution was heated at 80 Vfor 15 hours. wherein:

The volatiles were distilled oi and the residue was crys- (2,2,6-trimethylcyclohexyl)propyl] N,N dimethyl-1,6- hexanediamine bis(ethobromide), M.P. 19o-198.

m represents an integer from Oto 1 and n represents an integer from 2 to 12.

9. A compound represented by the formula Hr Hs ride.

References Cited in the file of this patentV UNITED STATES PATENTS Goldberg et al Feb. 28, 1956 Goldberg et a1 Feb. 28, 1956 Cheney Oct. 16, 1956 Luduena June 11, 1957 Kralt et al. Apr. 19, 1960 

1. A COMPOUND REPRESENTED BY THE FORMULA 